emonGLCD mod

I want to add an i2c device to my emonGLCD.  Am I correct in thinking that I need to disconnect the light sensor,switch 3 and R7 in order to allow i2c communication?  

pmielone's picture

Re: emonGLCD mod

I'm also planning to use I2C for replacing GLCD with cheap 20x4 display. I have disconnected light sensor, R6 and R7 but no luck yet. 
In PWR/SER/I2C pins I have connected:
  • 3= Ground,
  • 4= PWR,
  • 5= SDA and
  • 6= SCK (SCL).
But, it doesn't work. Especially SCK/SCL bothers me, is that same?
Is anyone having a Hello World example that works in EmonGLCD? I have example one that works in ArduinoUno, but not in emonGLCD. Any advices?
Here is an example, I have used in testing...

/* YourDuino.com Example Software Sketch
16 character 2 line I2C Display
Backpack Interface labelled "YwRobot Arduino LCM1602 IIC V1"
terry@yourduino.com */

/*-----( Import needed libraries )-----*/
#include <Wire.h>  // Comes with Arduino IDE
// Get the LCD I2C Library here:
// https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
// Move any other LCD libraries to another folder or delete them
// See Library "Docs" folder for possible commands etc.
#include <LiquidCrystal_I2C.h>

/*-----( Declare Constants )-----*/
/*-----( Declare objects )-----*/
// set the LCD address to 0x27 for a 20 chars 4 line display
// Set the pins on the I2C chip used for LCD connections:
//                    addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address

/*-----( Declare Variables )-----*/

void setup()   /*----( SETUP: RUNS ONCE )----*/
  Serial.begin(9600);  // Used to type in characters

  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn on backlight

// ------- Quick 3 blinks of backlight  -------------
  for(int i = 0; i< 3; i++)
  lcd.backlight(); // finish with backlight on 

//-------- Write characters on the display ------------------
// NOTE: Cursor Position: (CHAR, LINE) start at 0 
  lcd.setCursor(0,0); //Start at character 4 on line 0
  lcd.print("Hello, world!");

// Wait and then tell user they can start the Serial Monitor and type in characters to
// Display. (Set Serial Monitor option to "No Line Ending")
  lcd.setCursor(0,0); //Start at character 0 on line 0
  lcd.print("Use Serial Mon");
  lcd.print("Type to display"); 

}/*--(end setup )---*/

void loop()   /*----( LOOP: RUNS CONSTANTLY )----*/
    // when characters arrive over the serial port...
    if (Serial.available()) {
      // wait a bit for the entire message to arrive
      // clear the screen
      // read all the available characters
      while (Serial.available() > 0) {
        // display each character to the LCD

}/* --(end main loop )-- */

/* ( THE END ) */

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